title: Effects of intertrochanteric varus osteotomy on Norberg angle and percent coverage of the femoral head in displastic dogs.
abstract: This study was conducted to assess the effects of femoral varus osteotomy on joint congruency in dogs affected by early stage hip dysplasia. Preoperative planning to move the femoral head within the acetabulum was carried out. Varisation of the femoral inclination angle (fIA) was achieved by Intertrochanteric Osteotomy (ITO). Norberg angle (NA), percent coverage (PC) of the femoral head by the acetabulum and fIA was measured from preoperative, immediate postoperative and first and second recheck radiographs of seven dogs that underwent an ITO (joint n = 9). There was significant (p < 0.05) improvement of both NA and PC in all patients as indicated by a change in the mean ± standard deviation of 78.9° ± 7.5 and 36.9% ± 5.2 to 92.2° ± 6.7 and 50.6% ± 8.3, respectively. No significant difference (p < 0.05) was observed between the values of the planned femoral inclination angle (pfIA) of the femur and the effective femoral inclination angle (efIA) obtained after surgery (115.9° ± 2.5 and 111.3° ± 6.4, respectively). These findings could encourage the use of ITO in veterinary practice and indicate that intertrochanteric varus osteotomy should be re-considered for the treatment of early stage hip dysplasia in dogs with radiological signs of joint incongruency.
authors.affiliation: Department of Veterinary Clinical Sciences, University of Bologna, 40064 Ozzano Emilia, Italy. stefania.pinna@unibo.it
authors.forename: Stefania
authors.initials: S
authors.lastname: Pinna
authors.forename: Enrico
authors.initials: E
authors.lastname: Pizzuti
authors.forename: Fabio
authors.initials: F
authors.lastname: Carli
mesh_terms: D000818:Animals; D004285:Dogs; D005260:Female; D005270:Femur Head / Q000601:surgery*; D006617:Hip Dislocation / Q000601:surgery / Q000662:veterinary*; D007592:Joint Diseases / Q000601:surgery / Q000662:veterinary*; D008297:Male; D010027:Osteotomy / Q000379:methods* / Q000662:veterinary; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*
keywords: femoral inclination angle; hip dysplasia; intertrochanteric osteotomy; subluxation